-Hi, I'm Peter. Are you new here? I haven't seen you around?

-Hello, Peter. I'm Bob. I just _________ on Monday.

_________ we don't stop climate change, many animals and plants in the world will be gone.

_________ along the old Silk Road is an interesting and rewarding experience.

Susan had quit her well-paid job and _________ as a volunteer in the neighborhood when I visited her last year.

She and her family bicycle to work, _________ helps them keep fit.